Alkermes plc. — Director's Dealing 2014

May 20, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Alkermes plc. (ALKS)
CIK: 0001520262
Period of Report: 2014-05-17

Reporting Person: Pugh Gordon G (SVP, COO & CRO, Alkermes, Inc.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-05-17	Ordinary Shares	M	3275	—	Acquired	51576	Direct
2014-05-17	Ordinary Shares	F	1545	$43.59	Disposed	50031	Direct
2014-05-19	Ordinary Shares	M	300	$20.79	Acquired	50331	Direct
2014-05-19	Ordinary Shares	S	300	$45.00	Disposed	50031	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-05-17	Restricted Stock Unit Award	$0	M	3275	Disposed		Ordinary Shares (3275)	Direct
2014-05-19	Non Qualified Stock Option (Right to Buy)	$20.79	M	300	Disposed	2016-05-02	Ordinary Shares (300)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Ordinary Shares	5000	Indirect
Ordinary Shares	15000	Indirect

Footnotes

F1: This option exercise was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F2: This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3: This RSU award is fully vested in accordance with its terms.

F4: These options are fully vested in accordance with their terms.